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Hole Transport in Di‐p‐Tolyl‐p‐Nitrophenylamine Doped Poly(styrene)
Author(s) -
Borsenberger P. M.,
Gruenbaum W. T.,
Kaeding J. E.,
Magin E. H.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221910118
Subject(s) - formalism (music) , dipole , styrene , doping , van der waals force , physics , molecule , condensed matter physics , polar , chemistry , materials science , molecular physics , quantum mechanics , polymer , nuclear magnetic resonance , art , musical , copolymer , visual arts
Di‐p‐tolyl‐p‐nitrophenylamine (DTNA) is a highly polar donor molecule with a dipole moment of 5.78 D. Hole mobilities have been measured in DTNA doped poly(styrene) over a range of fields, temperatures, and DTNA concentrations. The results are described within the framework of a formalism based on disorder, due to Bässler and coworkers. In the disorder formalism, it is assumed that charge propagation occurs by hopping through a manifold of localized states with superimposed energetic and positional disorder. A key parameter of the formalism is the energy width of the hopping site manifold. For DTNA doped poly(styrene), the width is approximately 0.15 eV and independent of the intersite distance, or DTNA concentration. The width is described by a model based on dipolar disorder. The model is premised on the assumption that the width is determined by a dipolar component due to the DTNA molecule and a van der Waals component. The interpretation of the experimental results leads to the conclusion that the van der Waals component increases with increasing intersite distance.